The default values for the partial factors are set to what is prescribed for the current Design Approach.

For the Back fill the Wall friction slope φ_av and the Interior friction slope φ with corresponding partial factors are defined. It is possible to choose between Active pressure, At rest pressure or Compacted.

For the Front fill the Interior friction slope φ with corresponding partial factors are defined.

For Settlement data the Earth level before construction is defined. This means if the original earth level before construction was the same on both sides of the structure or not. In the latter case is defined how much higher the earth level was initially on the right side of the structure.

Failure surface

The option Advanced makes it possible to change the Failure surface slope ω and the Failure surface friction with corresponding partial factors.

Failure surface slope ω, see figure below.

With failure surface means the surface that limits the fill above the heel from the behind situated fill that contributes to the earth pressure. At overturning the fill will rotate above the heel together with the structure. Friction at the failure surface at rotation can be used by defining a friction slope larger than zero for the failure surface.

With the failure surface slope ω = 0 and the friction at the failure surface φ_aω = 0 (default values) a traditional retaining wall calculation is obtained with a vertical failure surface and a horizontal earth pressure.